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Finding the Fourth Proportional to 72.20, 99.54 and 54.68

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Solution

The fourth proportional to 72.20, 99.54 and 54.68 is: 75.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.20 : 99.54 = 54.68 : x
  2. Step 2: Convert to fraction form
    72.20/99.54 = 54.68/x
  3. Step 3: Cross multiply
    72.20x = 99.54 × 54.68
  4. Step 4: Simplify right side
    72.20x = 5,442.85
  5. Step 5: Solve for x
    x = 5,442.85/72.20
  6. Step 6: Final answer
    x = 75.39

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.